FNB Connect problems every month

Every month I have the same issue with FNB connect. I signed up for a 1 1 GIG SIM for R65 pm. The first month I was never informed of out of bundle rates and my account when over and they wanted to charge me over R394.02 rand for something I was unaware of and did not sign for on the contract. So after weeks of fighting they only debited my account with the R65pm as I signed for on the contract. They also capped my account at R65. So after the data runs out I will have to purchase my own data at my own discretion. However the next month I receive another bill for R204.59. Then again the fighting started. On the 15 September a FNB consultant phoned me and said that the invoices where back data and not fixed yet and that I will only pay R65 as I agreed to per month. So on the 1 Oct R65 was debited off my account. I though all was fixed. BUT I just received another bill for next month's debit that says I need to pay R R522.51. To me this looks like the months that the issues accorded has been totalled up to this amount. And the billing department hasn't fixed this account? I am so fed up. Every month after I get these bills I have to email FNB and then log complaints and fight. Cannot